Warp stop motion



-l 1949- I H. w. THATCHER ET AL 2,479,546

WARP STOP MOTION Filed Nov. 8, 1947 2 Sheets-Sheet l v 18 uvmvroas 12 HARRY W THATCHER y CARL D. BROWN A g 1949- H. w. THATCHER ET AL 2,479,545

WARP STOP MOTION Filed Nov. 8, 194'? 2 Sheets-Sheet 2 INVENTORS 6 mme W THATCHER BY CARL D. BROWN Patented Aug. 16, 1949 assi tm egrQq ream:

dale; k ss. a

mv ati m 0.12 Y a m is. B sma- Thisinvention relates to stop motions for lcoms, and more particularly to weep step mo times (if the type; empleyigag a pl uraiityg-ofs spaced banks of drep'wiiges; each which is sngpovted by anindividual, wai p thread anetis empleyged -to initiate lpqm stopping aetien when it ie: aliewed to fall incidentto brgakage car-excessive siackeningg-of its-assqciated-warp thread:

Step motions of thetype; towam which presentinyentign directed are cenvenfiqnaliy p vi d with surgn t nee en-me mee eb loom side, which suppqrt detectrbars and separatorbarsextending generally between the hemsides; :Ifihe; sepa jatqr serve the dual fume-- tion of senarating the individual dropwige banlgs and suppogting the eheetof? warp thread s and its load of drop wires. A typica1= stopmotien m gvigies fpr each warg thread an i nfiiyidu ar w ne wh h. t addl s o has pe se meg slot therein a. detecten barand-whichie Supported by itsmespective warp thgqad; Thedrbp wires are because of: epape reqpirementsdividegi into a lugality of grqurgs or banks and each 'qgop wire is individually Iqosely guided between two sep to l -re to keep; o oi" ea f rcin niterfering with those, of; omen-bangs. 'iihe separatorbars; saggggort the warp thread whigii hpldsup the neividuammpwire, in ain which; the engk' cf the detecter rba-i slot clears the upper edge of the detector harem?- qi n ly o pe t-a er in e e f e ec ae in the threa'ci, to prevent warn stogi; a warp threaq becpmesmerely slightly slack or loose. I15" however, this; degree 9f slaclip ese 18BX- eeedeci' orif the warp thread *lgrea-ke t lge Grop wire is by action ePgyavity and 190m viggatipp lowered tea peeitien' where it engages the detectonbar' and initiates 100m stegpage. Betecter bars are cat-various sorts-a n are effpoth eleetgicat and' mechanical types. The present-inventi 'on is illustrated: in conneetien with a'step meti'cn employing electrical: etetecter have, as, will became evident hereinafitev certain ifeatures of the inventienare equally applicablet0. step motions: of themechanicattype. Under certain circumstances encqqntered weaving mills it is desirable that-thcse members of the warp step metienwhichextend aemss-the 100m, suchas the detector bars angswe ter ,bars, be readiiy removable from the'leeni. Fer example, upon exhaustion of the warp snyplyon the warp beamof the learn, it ieeemmon-pmetice to remove with the woven cloth and trailing warp ends the harness frames and: wig-e banks; tel anew at immediate nepl 9f the (Cl. i

old. war-pheam by; a new-Win21 b am-1 till i wee has already been, emmniime a c oi; f-92 We and heimsef-mmea fihene nm elaenmem beam has; he war-p, threads. threaded thee placement harness frame heddles and drop so theeshutadewx-ni time Den ed; oi mom. can be. made; as: small: .ae DJEQQ iQ -MEEE. 2 replacement harness; frame (LZQRrYiHQx are, tiext to: the new; wen; be m wake 91 Wixtes: being mounted; on; dummy Qfi 12 15?) and as span. as; the; cilia were, be m. 9;? W426 banks: anglrhamessesere eat-0mm we beamdefittediinto thealoom; Eiittm m 1fl3 is inflamed; by han ng ne replee me n m:-

nessee amt replacement, of the: di nmw he e. by that det ction bars. Iit semetimes tile Rfimiifi to Liiiteut the 01d s et-etadeteetonbiaris Qfithewenv stop matien the am wen ems emqeially when the drop wines; exetmzeee a 9 he: iatectmsbars; bqt. leaym the sepa atism bans, 13- place. across; the loom, neee itat ifi ifi li thetreplaeement set. of? harmsfri mQfi; QYQ r separator-bans, and since; the item am q it heavy; cneatesiam ardueus task. i i t iii; 99? tabeedesinwemwhe able taneae tv weave the detector bars: 50; they may; be. ,talien Mi t t e, ai warn. and; no.1 be. able to neaqily. tr m yee the: ena.- mtor hams ea wel so the ha ness n fis he lifted as. mentiened, but may: he mem forwardly through. the; space. lamamalix qecnpied b that emnfiiaflfi i hare. exam ne; the w ne mohinn sunnontsbxaeketa ane sm fimly' tefienw' tapmaiden leae spans the. ham si It is oficensiflemblfiaimmflfidwfl; n. bot camera-t m Beatlemania-pee of mm; Wmmet me emnleyingz-dafiecimz-hexe that the si tepte bars be maintained each securely in, fixed p9- sition, to avoid vibration-inglnged; talse, indicatienaefmamtimeedi breaka e. a se tie izexeat immrtame'im electn ah step motiens cf the, tim

warme item ete i seez-th n eq iiw v and in: me nteimne iefieqtwe relec tieaii g nmt at all of the eiectmdesmtthe (ten ments. lik mistin bmcketsuieeet si atithe si es 91? t lawn :laaxe hem ntexe; been O f uasteenstm w 1 weanling case. :welgis on seeessea fen seatin the sepamtoe ham amt detecter baEs, and it hasheen found that irregularities in size and shape! of the wells-am a source. ofi-mu ch a: the; objgztionto the base.

along lines 2-2 of 3 able looseness and misalignment of parts. One attempt to avoid these difficulties resulted in a supporting structure composed of a rod on which were mounted a number of specially machined blocks. It has been found however, that the numerous machining operations necessary make that structure too expensive for practical purposes. Furthermore, unless both the support blocks and the bars supported thereby are very accurately machined, one or more of the bars soon is loosened in loom operation, with the aforementioned undesirable results. Additionally the multiple-block type detector bar support structure utilized either a single-piece electrical conductor in the form of a spring, or a series of conductors bolted together, to interconnect the.

live electrodes of the detector bars. The singlepiece type of connector is found to give unsatisfactory and non-uniform contact; while the bolted-together conductors, although furnishing excellent electrical connections, are bothersome to disassemble and reassemble each time the detector bars are removed and replaced in. operation.

With the above considerations in view it is an object of the invention to provide a warp stop motion including support means so constructed and arranged as to provide clear forward passage space for movement of the harness frames warp stop motion brackets and to support other principal components of the stop motion at one side of the loom;

Fig. 6 is a sectional view taken along line 6-6 of Fig. and in the direction indicated;

Fig. 7 is a plan view of a part of the warp stop motion;

Fig. 8 is a view in elevation of a part of the warp stop motion;

Fig. 9 is an end view of structure depicted in Fig. 8;

stop motion having detector bars having live and grounded electrodes, and including a base an readily removable unitary means acting to positively electrically interconnect the live electrodes of the detector bars and to firmly maintain the detector bars in fixed position relative Another object of the invention is to provide a warp stop motion the several parts of which are so made that the recesses or seats cally be machined to provide accurate spacing and seating of the parts while maintaining ease of assembly and disassembly of the bars. Another object is to provide general improvements in warp stop motions for looms.

The foregoing objects and others that will hereinafter become evident from a consideration of the whole of thisdisclosure and the environment thereof are attained by the present invention, a preferred embodiment of which is disclosed in the following description considered with the accompanying drawing forming part of the disclosure.

In the drawings:

Fig. 1 is a top view of a warp stop motion according to the invention, with portions ofthe separator bars and detector bars removed to improve the scale of the figure;

Fig. 2 is a sectional view taken substantially Fig. 1 in the direction indicated;

Fig. 3 is a sectional view taken substantially along planes indicated by lines 33 of Fig. 2, in the direction there indicated;

Fig. 4 is a partial sectional view of supporting structure and appurtenant parts at one side of the loom, taken along planes indicated by lines 4-4 of Fig. 2 and viewed in the direction there indicated;

Fig. '5. is a view in elevation of a stopmotion base adapted to be mounted on conventional Fig. 10 is a sectional view taken along a plane indicated by lines ill-l0 of Fig. 8, viewed in the direction indicated;

Fig. 11 is a plan'view of a component of the warp stop motion; and

FigflZ is a sectional view taken along a plane indicated by line l2-l2 of Fig. 11 and in the direction indicated.

Referring to the drawings, and more specifically to Figs. 1 and 2, the stop motion includes two principal supporting structures, one at each side of .the loom and respectively designated generally by numerals 8 and 9. These supporting structures include a pair of bracket supports I0, I I of any suitable shape arranged to be secured to respective loomsides and upon which the warp stop motion proper is supported. Bracket supports l0, II have secured thereto respective support brackets l2, l3 as by respective bolts I4. I 5, the brackets being alike in form.

These brackets, l2 and I3, serve as elements upon which the warp stop motion base members may be supported and adjustably rocked to bring the various warp stop motion parts into proper angular relationship with the warp threads. To allow such rocking adjustment to be effected brackets l2, l3 are provided with arcuate holes l6, l1 (see'Fig. 2) through which bolts l8 and I9 are adapted to pass. Bracket supports i i brackets I2, I3 are or may be of conventional form and per se are not of the present invention. In view of the general similarity of the warp stop motion structures at the respective loomsides, the following description will for the sake of brevity be limitedinsofar as is practicable to the structure at one side of the loom; and only in those cases wherein the parts at opposite sides of the loom are materially different will both be described or the differences noted.

Held to bracket .l 2 by the aforementioned bolts l8, I9 is abase 20 (see Figs. 2 and 5) which has an integral downwardly extendin flange 2| provided with arcuate holes 22, 23 arranged to register with holes IE, IT, respectively, in bracket l2. It will be evident, therefore, that base 21! may be angularly adjusted through a considerable range of positions with respect to the warp threads. Secured in base 20 at opposite ends thereof are upright studs 24, 25 upon which are mounted in superposed fashion other members of the warp stop motion structure as will presently be described. Also secured to base 20 as by means of cap screws 26, 21 turned into tapped holes 28,29 formed in the base, are clamp members 3|], 3! (see Fig. 2). These clamp members are interchangeable and are formed and arranged to support and clamp warp guide rods 32, 33 which extend across the loom. Rod 32 is formed of stock of rectangular cross-section, and rod 33 is formed of stock of round (preferably tubular) cross section. By employment of two clamp members 30 two warp support rods 32 may be employed; and likewise if two clamp members 3| are used, warp support rods like 33 may be employedi' Interchangeableclamps are desirable so warps of various widths, weights, and other characteristics may be accommodated. The clamp members and: associated rods are so formed with respect to shape and size that regardless of the combinationofrods 32, 33 employed, the level of the warp sheetbe the same, it being understood that a clamp member 3 lwill always be. used with a round? rod and a clamp member 3llwith a rectangularrod. Base is'oftheform and shape illustrated; at onesideof the loom; and its mate; at" the opposite side of the loom is of complementary-dorm of opposite hand. The base has an inwardly directed ledge 34 (see Fig. 6) which is'provided: with vertical, milled slots 35 (Fig; 5) which are formed of such width as to accommodate. the ends of respective drop wire bank; separator bars 36 as indicatedin Fig. 2. To support bars 36. in slots 35- a detachable, shaped member 3T-isfastened to the-underside of the base, as by'meansorscrews38, 39; in position to underlie the ends of the separator bars, as indicated in Fig. 2-. The milled slots are readily formed in a single machining operation, and allow ready upward removal of the separator bars from base 20. The proportions of member 3? and bars 36 are such that the top surfaces of the bars will-be aligned with the uppermost surfaces of rods 32, 33 when member 31 is in place.

Supported on seats 24a, 25a formed on studs 24, 25; respectively, is a detector bar support-40 (see Fig. 7), provided with bored ears 4|, 42- at its opposite ends and adapted for placement upon and positioning by; studs 24, 25, as indicatedin Fig. 2. Asshown in Fig. 7, detector bar support 40 is provided with-a series of milled transversehorizontal-slots 43-, which are of such width and depth as to accommodate respective ends of detector bars. (See Figs. 2', 3 and 4.) Support 40 is also provided with'a series of vertically extending channels 45 which are of such depth and-disposition as to allow ready upward movementtherethrough of the respective ends of separator bars 36. It. is evident that slots 43 may readily and-accurately be cut insupport 40; hence the detector bars maybe accurately positioned in spaced-apart relationship. To prevent endwise movement. of the detector'bars out of slots 43 and for other reasons. set out hereinafter, a cap structure including a capand a cap base is provided. The cap: base, 45,.has oifset bored earsat its respective ends, the bores being so disposed andfonmed asto allow the cap-base to be fitted ontostuds 24; 25 above support 40 (see Figs. 1: and 2) ,in which position it is. adapted to be held by nuts on the studs, as indicated.

Cap base 46 is provided with laterally disposed screw may; with its nut loosened, be rotated into or out of one of the vertical. slots in the cap, as isevidentgfrom Figs. Iiand2l Cap 52 is-provided withaskirtzflz (see Fig; 3) which extends downwardly far enough to, act as a stopto prevent endwise movement of detector; bars 44 out of theinslotsus, J A. e ndzninctlomofscapMa is' to 75%; nectedt in. the conventional manner' to the consupport for firmly pressing the detector bars into firm seating relationship in slots 33 whereby' detector ban vibratioi-randi creep are prevented, reduced or eliminated, and, in thecase of electrical detecton bars; the: live. upper electrodes are interconnected and the lower ground electrodes thereofare firmly grounded to the loom frame.

To achieve the desirable results just mentinned: andothers to be mentionedlater, cap 52 (see Figs; 2 and=3-) has secured thereto'in any suitable manner, as by screw means 55- passing through-- holes formed in the-l cap, a block 56 of electrical insulation employed to support a series of articulated electrically conductive pressure units: Block- 56 is. provided with a series of spaced apart. vertically disposed. counterbored holes 55 through each of which is passed a respective headed pin 58; One head of" each pin bears uporra. respective washer 58a fitted in the counter-bore of its' ho-le. Loosely carried oneach pin is anelectrically conductive plate 53 (see Figs; 11 and 12%, which has a centrally located flared aperture 59a through which the pin-passes and into the flared recessof which aperture the headed or upset lower end of the pin may" fit. Also-carried by each pinis an electrically con ductive-spr-ing 60* and a washer 61- disposed between the spring and therespective plate '59. Each spring- 60 applied on its respective pin in a" compressed state; after whichthe washer Fl and plate 59-areappl'ied and the pin upset, so whenthe spring is released it tends to press the plateagainst'the upset end of thepin, as isevi-dent from aconsideration of Fig. 2. The pin; plate; spring and washers form one of a series of articulated electrically conductive pressure-unitseach ofwhich: serves to maintain; in conjunction with another or other'such units, a paito fdetector bars r'i' re spective slots 43, and; further serves to effectively electrically connect the live (upper) electrode of an assoeiated detector'bar with an electrical bus bar 62 formed of a flat conducting str-ipthrough which pins 58 pass, andwith others of theseries of 'units, and to eiiectively ground the lowerelectrod'e of the associated detector barto the-loom tram via-support 401 (See Fig. 2.)

trodes, while the intervening plates straddle a respective pair of ends of the alternate plates.

depressions, as indicated'in Figs. 11 and 12; the

shapes and dispositions of the tits being such that! a tit on-one ericlof an alternate plate en-' gages in a depression on an adjacent end of an intenvening plate; cnvlceversa, s de pressi'ons aid? in maintaining the plates in proper relative positions and articulation of theplates under the action of springs 60. Thus it is evident that with can 52 in place with the wing nuts tightened and the springs compressively urging plates 59 downwardly, the detector bars are firmly held seated in fixed positions in slots 43, that the live upper electrodes are effectively interconnected" and to a bus bar, and that the lower ground electrodes are efiectively grounded. It is evident that bus bar- 62 may be employed as-a live terminal and the loomfr-ame-or support 40 the ground terminal, of theelectrical warp stopzmoti'on, theseterminals being in turn con- As depicted .inthat fig-ure, alternate ones of the series of plates-59 straddle and? thuselectrically interconnect a respective pair'of live detector bar elecventional electric energy source and stop motion magnet.

Referring to Figs. '1, 2 and 3, it will be evident that the detector bars and separator bars may readilybe removed from the support structure upon simply removing cap 52 (as by loosening the wingnuts on swivel screws 50, and swinging the swivel screws outwardly from slots 53 and lifting the cap bodily from pins 48, 4 9); after which the bars are free for vertical movement unhindered by any part of the structure. The same action takes place at the opposite side of the loom, the only substantial difference being that the cap, 52', at that side is slightly different in form as will hereinafter be more fully explained. As indicated in Fig. 4, after cap 52 has been removed, which is a very simple operation, detector bars 44 may be. lifted vertically from slots 43, and separator bars 36 lifted out of slots 35, the ends of those bars passing through respective channels 45 in detector bar support 40. Likewise, a replacement set of bars may readily be placed and locked in position in the supporting structures, and electrical interconnection of the sets of electrodes automatically effected upon replacement of cap 52. It will be understood that the articulated pressure units remain sesurely attached to cap 52 when the latter is removed, since block 56 is secured to the cap. Further it will be understood that when the cap is in lace and the wing nuts on swivel screws 50,

5| are tightened, each of plates 59 will rise on its respective pin, hence slightly compressing its associated spring 65. It is thus that the springs are effective to cause complete seating of the detector bars and positive electrical interconnection of the sets of electrodes, live andgrounded.

Since it is necessary electrically to interconnect one end only of the detector bars, the cap structure at the side opposite cap 52 may be somewhat simpler than cap 52. As indicated at the left hand side of Fig. 1, the live electrodes of the detector bars at that side are terminated some distance from the 'ends of the outer, grounded electrodes. A' cap 52', shaped as indicated in Figs. 8, 9 and is provided, somewhat similar to cap 52 but having no insulating,

block. Cap 52 is merely a casting having counterbored holes to receive pins 58 and spring 60, the pins each having a plate 59' similar to or like plates 59 and a washer 6! like washers fil and being headed over at their top ends so as to be unable to escape from the cap. Cap 52' is mounted on pins exactly as is cap 52, but plates 59 do not press upon the live electrodes since the latter are terminated short of the cap as above noted. Rather, plates 59 pressupon respective outer electrodes, holding the latter firmly seated in slots exactly as at their opposite ends. In other respects, the supporting structure at 9 is similar and complementary to that at 8.

It will be understood that in cases where the invention is applied to an arrestable vibrator or other mechanical type of warp stop motion, the

'be placed in the loom, screws 26, 21 and wing nuts on screws 58, 55 are loosened, at both sides of the loom. Guide rods such as 33, 34 and caps as 52, 52' are removed, and the detector and separator bars raised bodily from the loom. This procedure requiresonly afew seconds time by an experienced person, I and leaves the space betweenthe respective bases 20 free for passage therebetween of the new harness frames. After hanging of theframes, replacement of the guide, separator, and detector bars is readily effected in an obvious fashion.

, For clarity in the drawings wehave omitted nearlyall of the drop wires from the illustration. As is customary each detector bar is provided with its own individual bank of wires. The latter may-be of any suitable conventional form, and per se are not of th present invention.

From a consideration of the above disclosure of a preferred embodiment of theinvention it will be evident that while the objects of the invention are fully attained thereby, changes and modifications will occur to those skilled in the art.

Accordingly we donut wishto be limited to the precise details of construction employed in the preferred embodimenig but what we claim is:

1. In combination in an electrical warp stop motion: a cap structure including a cap base, a cap, and quick-disconnect means attaching the cap to the cap base; said cap including a series of articulated electrically conductive pressure units and means insulating said units from the remainder of the cap structure, said units being normally self-interconnected electrically.

the detector bars into fixed engagement with the support means.

3. In a warp stop motion of the type including spaced banks of drop wires, a detector bar for each drop wire bank, a separator bar for each space between next adjacent drop wire banks, support means at each end of the drop wire banks ..upporting adjacent respective ends of said detector bars and separator bars, and articulated pressure units positioned .at at least one end of the drop wire banks and carried by and insulated from the support means for pressing each detector bar individually into firm contact with the support means.

4. In combination in a warp stop motion: detector bars; a detector bar support having spaced slots each for and seating a respective end of an individual detector bar; a cap structure including a cap base, a cap, and'quick-disconnect means attaching the cap to the cap base, the cap including a series of'articulated pressure units one for each space between next adjacent detector bar ends and said units being capable when in normal position of exerting downward seating pressure on said detector bar ends; structure holding said detector bar support and said cap base in fixed relative positions with said quick-disconnect means acting to cause said pressure units to occupy said normal position; and means supporting said detector bars at their other ends.

5. In combination in an electric warp stop motion: detector bars each having a live and a ground electrode; a detector bar support having spaced slots each for. and seating a respective end of an individual detector ,bar; a cap structure including a cap base, a cap, and quick-disconnect means attaching the cap to the cap base, the cap including a series of articulated electrically conductive pressure units and means insulating said units from the remainder of the cap structure and there being one of said units for each space between next adjacent detector bar ends and said units being normally self-interconnected electrically and capable when in normal position of exerting downward seating pressure on said detector bar ends and of electrically interconnecting said live electrodes; structure holding said detector bar support and said cap base in fixed relative positions with said quick disconnect means acting to cause said pressure units to occupy said normal position; and means supporting said detector bars at their other ends.

6. In combination in a warp stop motion of the type having spaced banks of drop wires: spaced detector bars, one for each bank of drop wires; separator bars, one for each space between next adjacent detector bars; means including a base supporting an adjacent end of each separator bar and having upwardly opening slots therein each receiving a respective separator bar end; a detector bar support positioned above said base and having upwardly extending channels each for upward passage of a respective separator bar end therethrough, said support also having horizontally extending spaced slots each for and seating a respective end of an individual detector bar; a cap structure including a cap base, a cap, and quick-disconnect means attaching the cap to the cap base, said cap including a series of articulated pressure units one for each space between next adjacent detector bar ends and said units being capable when in normal position of exerting downward seating pressure on said detector bar ends; structure holding said first named means, said detector bar support and said cap base relatively fixed in said respective positions with said quick-disconnect means acting to cause said pressure units to occupy said normal position; and means supporting said separator bars and detector bars at their other ends.

7. In combination in an electric warp stop motion of the type having spaced banks of drop wires: spaced detector bars, one for each bank of drop wires and each including a live and a ground electrode; separator bars, one for each space between next adjacent detector bars; means including a base supporting an adjacent end of each separator bar and having upwardly opening slots therein each receiving a respective separator bar end; a detector bar support positioned above said base and having upwardly extending channels each for upward passage of a respective separator bar end therethrough, said support also 55 having horizontally extending spaced slots each for and seating a respective end of an individual detector bar; a cap structure including a cap base, a cap, and quick-disconnect means attaching the cap to the cap base, said cap including a series of articulated electrically conductive pressure units and means electrically insulating said units from the remainder of the cap structure, there being one said pressure unit for each space between next adjacent detector bar ends and said units being normally self-interconnected electrically and capable when in normal position of exerting downward seating pressure on said detector bar ends and of electrically interconnecting said live electrodes; structure holding said first named means, said detector bar support and said cap base relatively fixed in said respective positions 10 with said quick-disconnect means acting to cause said pressure units to occupy said normal position; and means supporting said separator bars and detector bars at their other ends.

8. In combination in an electric warp stop motion of the type having spaced banks of drop wires: spaced detector bars, one for each bank of drop wires and each including an upper live electrode a lower ground electrode and insulation separating the two electrodes; separator bars, one for each space between next adjacent detector bars and acting to separate each bank of drop wires from the others; means including a base supporting an adjacent end of each separator bar and having upwardly opening slots therein each receiving a respective separator bar end; a detector bar support positioned above said base and having upwardly extending channels each for upward passage of a respective separator bar end therethrough, said support also having horizontally extending spaced slots each for and seating a respective end of an individual detector bar; a cap structure including a cap base, a cap, and quick-disconnect means attaching the cap to the cap base, said cap including a series of articulated electrically conductive pressure units and insulation means electrically insulating said units from the remainder of the cap structure, there being one said pressure unit for each space between next adjacent detector bar ends and each unit comprising a headed pin mounted on said insulation means, a plate on each pin and retained thereon by the head of the pin, and a spring on the pin tending to press the plate against the head of the pin, said units being normally self-interconnected electrically and capable when in normal position of exerting downward seating pressure on said detector bar ends and of electrically interconnecting said upper live electrodes; structure holding said first named means, said detector bar support, and said cap base in relatively fixed condition insaid respective positions with said quick-disconnect means acting to cause said pressure units to occupy said normal position;

and demountable means disengageably supporting said separator bars and detector bars at their other ends.

9. In a warp stop motion of the type including spaced banks of drop Wires and a plurality of detector bars, one for each drop wire bank, supporting and retaining means at each end of said detector bars, and an articulated contact and pres- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1.355909 Regan Oct. 19, 1920 1,751,304 Brown Mar. 18, 1930 2,139,456 Noyes Dec. 6, 1938 2,160,776 Brown May 30, 1939 

